首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
We experience different forms of the sun’ s energy every day. The sun is the major source of energy for our planet. It causes th
We experience different forms of the sun’ s energy every day. The sun is the major source of energy for our planet. It causes th
admin
2012-10-16
54
问题
We experience different forms of the sun’ s energy every day. The sun is the major source of energy for our planet. It causes the evaporation (蒸发) of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food.
Much of the energy that comes from the sun never reaches the earth’ s surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30%is reflected by clouds or the earth’ s surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023% , is actually used by green plants to produce food.
Many gases found in the atmosphere actually reflect heat energy escaping from the earth’ s surface back to the earth. These gases act like the glass of a greenhouse in that they allow energy from the sun to enter but prevent energy from leaving. They are therefore called greenhouse gases.
When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. Dark-colored surfaces, such as dark soil or forest, absorb more energy.
We learn from the passage that______.
选项
A、all living things on the earth depend on the sun for their food
B、a forest looks dark in winter because it absorbs solar energy
C、only 0.023 of the energy from the sun is made use of on the earth
D、greenhouse gases allow heat energy to escape from the earth’ s surface
答案
A
解析
推理判断题。由第一段可知:阳光给绿色植物提供能量使其生产自己的食物,故选A。
转载请注明原文地址:https://kaotiyun.com/show/Hvwd777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
Sheisthefirstspeaker______gavethespeechatthemeeting.
WhywasHenryFordabletosellmillionsofcars?
WhenshouldJanegotoseeProfessorWhite?
Whatistheprobablerelationshipbetweenthespeakers?
Whatisthecompanygoingtodo?
Wheredoesthisconversationtakeplace?
Ifthewomanhastoaskforasickleave,whoshouldsheturnto?
Accordingtotheartdealer,thepainting______togoforatleastamilliondollars.
Danbyleftwordswithmysecretary______hewouldcallagainintheafternoon.
Chicagoisagreattown.Iloveit.Wehavetwobaseballteamshere,theCubsandtheWhiteSox.IliketheCubs.TheWhiteSox
随机试题
公元前5世纪后期.智者被用来专指以收()授()为()业的()教师。
汉武帝在遣使通西南夷的过程中,先后派出的使者有【】
在Windows7中,______是基本的操作对象,是用户与各种软件之间沟通的界面。
A.知母B.天麻C.金银花D.羚羊角E.党参具有“鼓槌状”外形的是
小儿痰湿咳嗽的临床特点是
A.肾上腺素B.去甲肾上腺素C.异丙肾上腺素D.多巴胺E.间羟胺由于可直接舒张支气管,并能消除黏膜水肿,因而常用于支气管哮喘
根据《1974年国际海上人命安全公约》,船舶消火栓的数量和位置,应至少能将两股不是由同一消火栓发出的水柱,射至船舶在航行时旅客或船员经常到达的任何部分,而其中一股应仅用一根消防水带。()
梨园是()朝宫廷设置的专门训练乐工的机构。[2013年真题]
行列式的第4行各元素的余子式之和的值为_______.
中国将削减煤炭消费量,以减少空气污染。关于有效利用煤炭的2015~2020年行动计划表明了中国使用绿色能源的努力和目标。减少煤炭消费量将涉及淘汰落后产能(outdatedproductioncapacity),并使用更清洁的能源,如核能、风能和太阳能。
最新回复
(
0
)